(Click image to enlarge)
Are the calculations reasonable? I am skeptical that the narrow PAMF ramps leading below grade can spontaneously vent 75% of the toxic vehicle emissions per the report delivered at the 11th hour during the Council Meeting.
The 150,000 square foot underground parking garage has 399 parking spaces. Each vehicle is estimated to circulate for 10 minutes per visit (5 minutes entering and 5 minutes exiting). THAT’S a heaping load of traffic exhaust!
NOTE: For an illustration of the PAMF 14’x14′ wide chimney type, 94dBA parking garage exhaust fans, click on posting “PAMF Chimney Type Parking Garage Vents Dispel Hazardous Air Pollutants Adjacent to Residential Homes “
The Illingworth & Rodkin, Inc report for the Palo Alto Medical Foundation PAMF Project assumes that only 25% of the vehicle emissions will need to be vented through the PAMF 94dBA loud garage exhaust vents designed by Hawley Peterson Synder Architects, above ground, near the residential homes. That leaves 75% of the carbon monoxide to expel independently through the vents.
The report states “Assuming the model that ONLY 25% of the trapped emissions would need to be expelled through the vents, the results of the carbon monoxide concentrations would be 8.9 parts per million (ppm) for 1-hour exposures and 4.7 ppm for 8-hour exposures.
The State ambient air quality standards are 20 ppm for 1-hour exposures and 9.0 for 8-hour exposures.”
What would happen if, actually, if the numbers were reversed and the expelled carbon monoxide is 25% through the Parking Garage Ramps and 75% at the residential border?
Do the MATH and share your comments!